Yellow lake.



UNITED STATES PATENT OFFICE.

ERNST MIECKBACI-I, OF VOHWINKEL, NEAR ELBERFELD, GERMANY, ASSIGN 'OB TO FARBENFABRIKEN VORM. FRIEDR. BAYER & C0., 01? ELBERFELD, GERMANY, A

CORPORATION OF GERMANY.

YELLOW LAKE.

No Drawing.

Specification of Letters Patent; Application filed May 17,1910. Serial No. 561,866.

Patented Sept. 13, 1910.

which have a valuable yellow shade and are fast to light, oil, alcohol, water and resistthe action of chemicals such as chlorin or nitric acid.

In order to illustrate the new process more fully the following examples are given, the parts being by weight Example 1: A solution of 10 parts-of symmetrical 1.8 dibenzoyl diamlnoanthraquinone in 100 parts of sulfuric acid (66 B.)

cooled to 10 C. is added to a solution which has to be stirred of 20-40 parts of barium chlorid in 600 parts of ice water. The lake is filtered off, washed, dried and ground.

Example 2: 100 kilos of a 10 per cent. paste of symmetrical dibenz0yl-1.8-diaminoanthraquinone are dissolved in 100 kilos of caustic soda lye (34 B.), 300 liters hydrosulfite solution (17 B.) and 500 liters water. A solution of 40 kilos of aluminium sulfateis added to this vat and the lake is precipitated. b blowing air and CO into the mixture. he lake 1s then further treat ed in the usual way.,

Example 3: 10 parts of LB-dibenzoyldiaminoanthraquinone are ground together with 90 parts of heavy spar with the addition of water.

Any other method for producing pigments or lakes can be used.

The new yellow color lake prepared from the symmetrical 1.8-dibenzoyldiaminoanthraquinone, said lake bein distinguished by its valuable yellow sha e and'its fastness to light, water and oil, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses. 4

ERNST -MECKBACH. [1 8.] Witnesses:

Orro Komc, CHAS. J. WRIGHT. 

